legos, especially the technic sets. and from back in the day before they had all the fancy specialized pieces. Also GI Joes and Star Wars action figures and accessories (we had an AT-AT, a walker, the ewok village, and a couple other small vehicles).

Oh yeah, the rockets! I used to build tons of those - even an SR-71 model.. that was very cool - I adapted it to take D-size motors in the wing tubes instead of a single A/B/C in the tail.. I was young and didn't know much about how a thrust difference between the two motors would cause it to spin out of control